浅埋近距离双线软土隧道施工仿真模拟的有限元分析

本文运用大型通用计算软件ANSYS对浅埋近距离双线软土隧道施工过程进行了二维非线性粘弹塑性有限元分析,在分析中采用了土的粘弹塑性本构关系,引入土的蠕变方程,充分考虑了土体变形的时间效应。同时采用广义虚拟支撑力的方法,考虑开挖面的空间效应,研究了双洞同方向其中一洞超前掘进隧道施工时围岩主应力、地表沉降、洞周位移、塑性区发展及支护结构内力随时间的变化规律。得出一些有益的结论,为今后隧道施工提供了理论依据。

Finite Element Analysis of Greep Formation of Shallow Embedded Adjacent Double Tunnels in Soft Soil

This paper describes a 2D nonlinear viscoelasto-plastic finite element analysis of the shallow embedded adjacent double tunnels construction process with the ANSYS software.In this analysis the principle of viscoelasto-plastic and the creep equation have been applied with considering the time-depend effect of soil mass settlement perfectly.At the same time the general virtual support force method has been applied with considering space-depend effect of the cut surface.And the study of the time-dependent behavior of the main stress of surrounding rock,surface settlement,tunnel surrounding settlement,plastic zone development and the internal force of lining structure have been done during the construction of double tunnels at same direction with the left one antecedently.So some good conclusions can be got as the theory reference for the future subway construction.